Combined synchronizing and telephone system.



G. E. HOGLUND. COMBINED SYNOHRONIZING AND TELEPHONE SYSTEM.

APPLICATION FILED MAR 5, 1910.

Patented June 7, 1910.

. f UNITED: STATES PATENT OFFICE.

GUs'rAv E. IibGLUND, or 'oHrcAGo, ILLINOIS, ASSIGNOR TOVWILLIAM n. SELIG r, or

CHICAGO, rumors;

COMBINED'SYN'CHRONIZING AND TELEI 'HONE SYSTEM.

To all. uihom it my concern:

Be it known that I),- GUs'rAv E. HooLUNo,"

a cit-izen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain-new and useful Combined Synchronizin and Telephone System, of which the fo lowing is a specification.

This device is especially intendedto provide accurate and delicate means for synchronizing two machines, and for permitting telephonemessages to transmitted over the same circuits which are used for the synchronizing process. It may further enable the use of the same listening apparatus,

- of a phonograph -'or other sound producing mechanism, for supplying music 'or conversation during the appearance of the scenes on the screen. Evidently, where such a combination is used, it is desirable, if not necessary, that the phonograph should be run in synchronisln with the'moving picture machine. Also, where such a combination is used, it is customary to placethe moving picture machinein the rear of the hall and the phonograph" in the front of the hall, so

that the sounds will seem to comefrom the screen or stage on which .'scenes are thrown. In such cases, it is desirable also that there should be )rovided easy means for sending messages roin the sta e operatoror manager to the operator of the moving picture machine. At the present time such commuuicationis usually afforded by means .of a

series of buzzers or by a telephone system, the latter being entirely separate from and iinlopendent o This necessitates a multiplicity of wires and other connections and apparatus, so that. the

combination is not satisfactory and has not been extensively used.

Various methods are employed synchronizing machines. In myv device]: prefer to use a method wherein a series of electricalimpulses are delivered to the line in any suitable manner, as, for example, by

placing a commutator on a rotating shafton each machine The instant of synchro- Specification of Letters Patent.

the synchronizing circuits.

Patented June -7, 1910.

Application filed March 5,1910. Serial No. 547,539.-

' nism may then be detected as the instant when these impulses are delivered by the two commutators' at equal or'proportionate speeds. The detecting device may be in the form of a telephone receiver, differential galvanometer, or other suitable mechanism.

The invention further consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawing, Figure 1 shows in outline, by common electrical symbols, the preferred arrangementof parts andcircuits for accomplishing the purposes. of this invention; and Fig. 2 shows a modified arrangement of mechanism for detectin the times of synchronism-, and for enabling a tele phone message to be received by the operator.

In the drawing, commutators 3 and 4 are so connected to the machines as to be rotated at speeds proportionate to the speeds 'of rotation of the moving picture machine and the phonograph, respectively. Such rotations may be accomplished by placing the com'mutators ,on shafts of the machines, so

that they will be" ositively driven. .How-- ever, the relation 'etween ,the synchronous speeds of rotation of the shafts and the number of electrical segments on each commutator 3 and 4 should be such that, when the machines are'running in synchronism, electrical impulses will be sent out on the line at equal speeds by the commutators 3 midi.-

In the preferred arrangement, a double telephone receiver 5 is provided, for detecting the time of synchronism of the machines. This double telephone receiver comprises ear pieces 6- and 7, properly connected by'a spring band'S so as'to hold them. against the cars; A 1nouth'piece9 is provided'to enable the stage operator or manager "to talk to the moving -picture machine operator, wh en desired. An electrical brake'ilO is under the control of the moving picture'machine operator, so thathe can start and' fstop the phonograph from his location "at'will. A storage battery llprovides current for carrying onall of the different operations associated. with my device. A switch board 12, carrying all'of the switches necessary for forming the different electrical connections,

.is intended to be conveniently located near the moving picture machine operator, so that he can form the proper connections at wilt This switch board carriesastarting Y the double receiver 5 at- '31.

' the body of. the conm'iutator 1'. so that. as

switchlii, which is adapted to energize the i To enable the stage operator or nianager brake inechanismIO, thereby allowing the phoitbgraph to start at the proper time. A. two-pointswitch 14 is provided for the pur pose'of enabling both of the telephone receivers to be tised for receiving communication from the transmitter 9. or for enabling both of the receivers to be usedduring the synchronizing process, depending upo'n' its position. In't-he ,position shown, it forms the proper connection for the synchronizing process, but when thrown to the point 15 it will be properly connected for receiving the telephone message. A doubleole tw-ooint switch 16 is also provided or eliangmg over from s \"nchroniz1ng to telephoning connections, it being shown in. position for synchronizing purposes. I will now descr be the manner in which the machines are intended to be synchro;

'niz-ed: \Vith the switches thrown into the position shown. current will llowdown from the battery 11, through the wire 17 into the switch H. thence into -the point 18, thence across through the wire 1!) down through the wire 20. and into the common connection of Here the current will split. a portion of it passing through the receiver-ll up through theconnection :22 and down through the arm 33 of the switch 16 to the point '21. From there 1t. will pass out over the CQIlilet'ilt'tIt25.111)

this commutator rotates, its contacts 26 will successively come into contact with a brush 27, thence the. current will pass up through pole of the battery 11.

the connections 29. 2t) and 30 into the other From this it will l)t seen that, as the commutator st rotates. a series of electrical impulses willbe delivered to the receiver (3. The other portion of the current delivered to the common point 21 will pass through the. receiver T and up through the connector 31 to the arm 3:! of the switch 16. Thence it will flow down through the point 33 and the conneetitm H to the body of the commutator-3. As the contacts'35 successively come into contac with the. brush 36, the current will tlow up' through the. connections 37 and 30 into the battery 11. Thus it is seen that as the commutator 3 rotates a series of electrical intpulses will be. delivered to the receiver T.

Inasmuch as the receivers (3 and 7 are adapted to be held conveniently to the ears. any diflerence in the peitiodicity of theimpulses from the commuta'tors 3 and 4 will be detected as a difference .n the frequency of the impulses heard in the receivers 7 and (3, respectively. The operator of the moving JlCUUC machine may then adjust the speed of his machine until the impulses are heard to come at equallspeeds in both of thercccivers, when he will know that the two down through the connection 31. across thecommon connection from the receiver 7 to the receiver (3, up through the connection 22, and down through the arm '23 to the point 39, thence 'out through the connection -.t1 and the line 42 tothe transmitter t). .H'ter passing through the transmitter, it will pass out over the "connection 43 to the. line 19, and thence through the connection 30 into the battery 11. In this case it is seen that neither of the conmiutattn's is incircnit with the receiversQbut that both of the receivers are lit circuit with the transmitter a. This being thecase, the only sounds which will be heard in the receivers (i and 7 will hethose thrown into'the transmitter 9. and these sounds will be heard with double strength, owing to the factthat they will be heard in both of the receivers.

\Vhen it desired to start, the phonograph, the switch 13 may bethrown over to the point 44.

Whenthis 'isjdone. current I will llow down through the connection 17 and the connection 45, through the arm 1 into the point 44. and over the line 46. to the brakelO, whence the current will tlow back over the lines 25'. '39. and 3t). tothe battery 11. 'lhereupon the magnets ot" the brake will be energized and the brake 47 will be drawn away from the moving portion-of the :phonograph. which will then start.

From the above it will be seen that after the moving picture machine operator has started the phonographby re easing. the

brake 47. he may adjust the speed of his machine so that itwill-always run in synchrimism with the phonograph. and in case he desires from time to time to receive conimunication either from the stage operator or manager or to hear more strongly the sounds given out from the phonograph. he may throw the switche. H and ll in such a manner that the phonograph sounds will he heard in the receivers t) and T.

In case it is desired to make use of other means for detecting thesynchronism of the machines. use mav he. made of any device which will detect the impulses from the commutators 3 and 4. and indicate a ditference between their frequency. This maybe in the form of a differential galvanometer, as is shown in the-modification of Fig. 2. In this case the connections 20, 22, and 31 may be madeas shown. A single or double receiver 

